Tricycle frame



FIG. 1 is a top plan view of a tricycle frame showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front elevational view thereof, the rear view being a mirror image of that shown; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for a tricycle frame, as shown and described. 